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Hi Inmates,I am designing and have begun buying components for a pair of Lowther/AER PM4As in Oris 150 horns in a d'Appolita array with 18" dipole woofers above and below the horns. The system will be bi-amped. The Lowther/AERs in the Oris horns will be a 15 ohm load with a sensitivity of 106 to 108 dB/2.83v/m.
After over 30 years of SS and PP tube amps I'm going to try SETs. Most of the amps I've considered use 300B or 2A3 output tubes. Any responses concerning the pros and of thses two either in general or for my particular application would be very much appreciated.
Follow Ups:
I have had 300B (TJ MPs), 2A3 (TJ 300B 2.5 v.), and 45s all designed by John Tucker. Previously I thought the ordering was 45s best, then 2A3s, then 300Bs. In fact until these Tucker amps, I could not stand the 300B. Now the order is the reverse. Tucker uses parafeed and active loads; maybe that makes the difference.
... you ought to be considering either a 45 amp or a one-stager 6S45P amp. I use both with my Hedlunds and have a preference for the one-stager. With the even greater efficiency Orises you don't really need more than a watt or so and this frees you to explore purity rather than power for your mid/highs.Brian.
What is a good source for those 6C45 tubes?
Hello Jose ,
I have built such an one stage amp with a E 55 L in triode mode , input with old studio transformers 1:2 , gridstopper , the tube , cathode resistor and output transformer , thats all . Look at the italian websites under www.paeng.it .
Regards , AlexK.
Alex,I found the PAEng website, but there is no mention of the E55L tube. Do you have any more information, I am curious?
http://digilander.libero.it/paeng/projects_frame.htm
-- jose k.
Hello Jose ,
go to devices , then to high u Tubes and then open part 1 on the paeng website . There is a list of possible tubes for this amps like EC 8020 , 3A167M , WE 437 and E55L in pseudotriode mode . I have done this with 60 ohm cathode resistor bypassed with 1000 uF and 140 volt plate voltage , then I have 55 mA current . I made this with a regulated power supply and it sounds amazing . The most simple "power" amp , I īve ever built . No hiss , no hum and no oszillation , I have used grid stoppers , ferrite beads and very short wires .
Regards , AlexK.
KWtubes can supply them . Make sure you buy a fair quantity , there seems to be a lot of variation
:)
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